I thought that the Romio just needs an ethernet connection (which would end up connected to the router via a switch), and not necessarily has to be connected directly to the router???

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Yes, any ethernet connection that can reach internet will do. My assumption usually though is that there are very limited ethernet connections if one is looking at MoCA, so most often the only ethernet available is at or near the router.

I have been a Tivo user since 1998 and still have all 6 Tivos I bought although only four are now connected. I have always had them networked. On 1/28/14 I set up my Roamio Pro and at the bottom of my Now Playing Lists each Tivo showed the other three units.

I just noticed that the Roamio no longer shows the two HD Series 3 nor the Toshiba Series 2 units. Those three units all show in each other's Now Playing lists, but none show the Roamio.

The Roamio was originally connected via wireless but 2 months (maybe longer) ago, I changed that and the Roamio is now connected via ethernet cable direct to my router.

Since I don't use those networked connections in the Now Playing lists all that much, it could be that the older Tivos and the Roamio lost their network connectivity when I added the ethernet but I am not sure.

How can I re-establish the network between the Roamio and the others?

I need to correct the above. The Roamio DOES list the three older Tivos in the Now Playing List but when I try to open any one of them I see this error message:

Can't Connect to XXXX DVR

The XXX DVR could not be found.

There may be a problem with your home network or the network connection on your Tivo boxes, or the DVR may have been unplugged.(C423)

For more info, visit tivo.com/help/C423

My networks are all functioning fine and the help for C423 was confusing at best.

I have been a Tivo user since 1998 and still have all 6 Tivos I bought although only four are now connected. I have always had them networked. On 1/28/14 I set up my Roamio Pro and at the bottom of my Now Playing Lists each Tivo showed the other three units.

I just noticed that the Roamio no longer shows the two HD Series 3 nor the Toshiba Series 2 units. Those three units all show in each other's Now Playing lists, but none show the Roamio.

The Roamio was originally connected via wireless but 2 months (maybe longer) ago, I changed that and the Roamio is now connected via ethernet cable direct to my router.

Since I don't use those networked connections in the Now Playing lists all that much, it could be that the older Tivos and the Roamio lost their network connectivity when I added the ethernet but I am not sure.

How can I re-establish the network between the Roamio and the others?

I need to correct the above. The Roamio DOES list the three older Tivos in the Now Playing List but when I try to open any one of them I see this error message:

Can't Connect to XXXX DVR

The XXX DVR could not be found.

There may be a problem with your home network or the network connection on your Tivo boxes, or the DVR may have been unplugged.(C423)

For more info, visit tivo.com/help/C423

My networks are all functioning fine and the help for C423 was confusing at best.

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Explain: although only four are now connected. I have always had them networked what the difference between connected and networked ?

So when not plug in the networked has no meaning, and plug in without the network also has little use.
I think I understand, but I am no sure.

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Now you are confusing me. Let me simplify. I own six Tivo units and two are in a closet somewhere. The other four are available for me to use at all times and on Stand By when not in use. I have had ALL my in use Tivos networked for years. In January when I got the Roamio Pro it was also added to my network and all Tivo units recognized each other even when in Stand By mode.

Some time after January, I changed my Roamio internet connection from wireless adaptor to an ethernet cable connected directly to my router.

When I changed the Roamio from the wireless adaptor to the ethernet connection it appears the older units could no longer find the Roamio. The Roamio still sees the older units but no longer has any means of connecting to them.

I guess the real question is how do I set my network so Tivos using a wireless connection and the ethernet connected Roamio can see and communicate with each other?